Intrinsic safety originates from the classification of explosion-proof electrical equipment used in underground coal mines according to GB 3836.4-2010 standard. Explosion-proof electrical appliances are classified into explosion-proof type, increased safety type, intrinsically safe type, etc. The characteristics of intrinsically safe electrical equipment are All of its circuits are intrinsically safe circuits, that is, circuits in which the spark and thermal effects generated under normal operation or specified fault conditions do not ignite the specified explosive mixture. That is to say, this type of electrical appliance is not explosion-proof by the outer casing and the explosion-proof of the filling, but the energy of the electric spark or thermal effect generated by the circuit in normal use or failure is less than 0.28mJ, that is, the gas concentration is 8.5% (the most explosive concentration) ) Minimum ignition energy. The intrinsically safe explosion-proof method is to use the safety barrier technology to limit the electric energy supplied to the field instrument to a safety range that neither generates a spark sufficient to detonate nor generates a temperature rise of the surface of the meter sufficient to detonate, thereby eliminating the explosion-proof method of the detonating source. You can come to Meihua Instrument to purchase the mine intrinsically safe sound and light alarm. MHY-13524 is an auxiliary device that emits sound and light alarm function when the over-limit is controlled by the matching equipment. The alarm is suitable for use in various working places in coal mines. Floating Shaver,Men Trimmer Shaver Rechargeable,Electric Beard Shaver,Professional Fabric Shavers ZHEJIANG SHENGFA ELECTRIC APPLIAMNCES CO.,LTD , https://www.sfelectricappliances.com